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A Tour of Go Switch evaluation order
Switch cases evaluate cases from top to bottom, stopping when a case succeeds.
(For example,
switch i {case 0:case f():}does not call f if i==0.)
Note: Time in the Go playground always appears to start at 2009-11-10 23:00:00 UTC, a value whose significance is left as an exercise for the reader.
package main import ( "fmt" "time")func f(num *int) int{ (*num) = (*num) + 1 return (*num);}func main() { num := 0 total := 3 switch total { case f(&num): fmt.Println(num) case f(&num): fmt.Println(num) case f(&num): fmt.Println(num) } fmt.Println("When‘s Saturday?") today := time.Now().Weekday() switch time.Saturday { case today + 0: fmt.Println("Today.") case today + 1 : fmt.Println("Tomorrow.") case today + 2: fmt.Println("In tow days.") default: fmt.Println("Too far away.") }}
case中的语句可以是返回值的语句
A Tour of Go Switch evaluation order
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